Have a Monte Carlo 2000 SS with weird speaker sounds. I have cd/tape deck and the back speakers are not very loud. I can turn bass & treble all the way up and fade to rear speakers and its barely above medium level sound. There is no bass and back speakers are pretty quiet. Still working to hear them but quiet. What would be the cause of the problem? Does it have an amp or is the box attached between the speakrs a keyless remote control box? ANy ideas? Just bought the car .